PEROXIDE CURABLE FLUOROELASTOMERS, PARTICULARLY SUITABLE FOR MANUFACTURING O-RINGS

摘要

New fluoroelastomers are described, having iodine atoms in terminal position and monomeric units in the chain deriving from an iodinated olefin of formula: CHR=CH-Z-CH2CHR-I (I) wherein: R is -H or -CH3; Z is a (per)fluoroalkylene radical C1-C18, linear or branched, optionally containing one or more ether oxygen atoms, or a (per)fluoropolyoxyalkylene radical. These products, upon peroxide curing, require extremely short post-curing treatments (around 30-60 minutes at 180.degree.230.degree.C) and are characterized by compression set values lower than 25% (measured on O-rings at 200.degree.C for 70 hours according to ASTM Standard D395 Method B).